The Latest: 7 earthquakes hit Oklahoma City area in 3 days

EDMOND, Okla. – The Latest on the recent cluster of earthquakes in central Oklahoma. (all times local):

1:40 p.m.

At least seven earthquakes have struck the Oklahoma City area in the last three days, including one that knocked out electrical service to nearby residents.

The Oklahoma Corporation Commission says the quakes rattled the area from Tuesday to Thursday morning. Each had a magnitude of 3.0 or stronger.

Commission spokesman Matt Skinner says there are no wastewater injection wells in the immediate vicinity, but he says previous well activity may be the cause. Scientists have linked a dramatic increase in quakes in Oklahoma, Kansas and Texas to the underground disposal of wastewater from oil-and-gas production.

Skinner also notes there's a fault line in the area. The area hit is about 15 miles (25 kilometers) northeast of Oklahoma City.

The strongest quake registered a magnitude of 4.2 Wednesday night. It knocked out two electric substations, leaving about 1,900 customers without power for about an hour. The most recent was a 3.3 magnitude quake Thursday morning.

No injuries or significant damage have been reported.

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6:40 a.m.

The Oklahoma Corporation Commission says its Induced Seismicity Department and the Oklahoma Geological Survey are investigating several earthquakes in the central part of the state.

At least six quakes of magnitude 3.0 or stronger have struck since Tuesday in an area about 4 miles (6 kilometers) northeast of Edmond — about 15 miles (25 kilometers) northeast of Oklahoma City.

The strongest was a magnitude 4.2 quake Wednesday night. It knocked out two electric substations, leaving about 1,900 customers without power for about an hour.

No injuries or significant damage are reported.

The injection of wastewater from oil and gas production into disposal wells has been linked to an uptick in earthquakes, but the commission said Thursday no disposal wells are in the area. A known fault is in the vicinity.